The Last Glacial Maximum (LGM; ∼23,000-19,000 years ago; ka) is the subject of extensive study and represents a global climate state dramatically different from that of today, characterized by reduced greenhouse gas concentrations and extensive ice sheets (Mix et al., 2001;Raynaud et al., 1993). Proxy records and climate models show that glacial-interglacial cycles are driven by orbital forcing and internal mechanisms such as variations in insolation, greenhouse gas levels, and distribution of ice sheets (
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